Krailas Kiyothong, Chureerat Satjipanon, and Opas Rodchompoo

pp. 579 - 585

Abstract

The objectives of this experiment were to study the effect of cutting time on seed yield and seed
quality of Andropogon gayanus cv. Kent in Korat soil series at Khon Kaen Animal Nutrition Research
Center, during April 1997 - January 1998. The experiment was arranged in a randomized complete block
design with 6 treatments and 4 replications. The treatments were: T 1 -no cut; T 2 -cut at 60 days after
transplanting; T 3 -cut at 70 days after transplanting; T 4 - cut at 80 days after transplanting; T 5 -cut at
90 days after transplanting; T 6 -cut two times: the first cut at 60 days after transplanting and the second
cut at 30 days after first cut.
The result revealed that pure seed yield of T3 was highly significantly greater than others (P<0.01).
Pure germinated seed yield of T3 was significantly greater than T5, T6 and T1 (P<0.05), but was not significantly different from T2 and T4. Thousand-seed weight of T4 was significantly greater than others
(P<0.05), but TSW of T3 was not significantly different from the other treatments. Seed purity and germination percentages were not affected by cutting time, ranging from 93 to 97 and 54 to 63 %, respectively. Height of T1 and T2 were significantly greater than T4, T5 and T6 (P<0.05), whereas T3 was not significantly different from the other treatments. Inflorescence length was not significantly different among
treatments, ranging from 54 to 66 centimeter. Tiller number of T3 was significantly greater than other
treatments (P<0.05), but T2 was not significantly different with the others. Inflorescence number of T3
was highly significantly greater than others (P<0.01). Percentage of fertile tiller of T1, T2, T3, T4 and T5
were significantly greater than T6 (P<0.05); percentage of fertile tiller was markedly and consistently
higher in the 5 treatments (T1, T2, T3, T4 and T5) and lowest in T6.